<template>
  <div>
    <el-tag
      :key="index"
      v-for="(tag, index) in dynamicTags"
      closable
      :disable-transitions="false"
      @close="handleClose(tag)">
      {{tag}}
    </el-tag>
    <el-input
      class="input-new-tag"
      v-if="inputVisible"
      v-model="inputValue"
      ref="saveTagInput"
      size="small"
      @keyup.enter.native="handleInputConfirm"
      @blur="handleInputConfirm"
      >
    </el-input>
    <el-button v-else class="button-new-tag" size="small" @click="showInput">+ New Tag</el-button>
  </div>
</template>

<script>
export default {
  data () {
    return {
      inputVisible: false,
      inputValue: ''
    }
  },
  props: {
    dynamicTags: {
      type: Array
    }
  },
  methods: {
    handleClose (tag) {
      this.dynamicTags.splice(this.dynamicTags.indexOf(tag), 1)
    },
    showInput () {
      this.inputVisible = true
      this.$nextTick(() => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    handleInputConfirm () {
      let inputValue = this.inputValue
      if (inputValue) {
        // forEach 不能使用 return false 跳出循环
        for (let i=0; i < this.dynamicTags.length; i++) {
          if (this.dynamicTags[i] === inputValue) {
            this.inputVisible = true
            this.inputValue = ''
            return false
          }
        }
        this.dynamicTags.push(inputValue)
      }
      this.inputVisible = false
      this.inputValue = ''
    },
  }
}
</script>

<style>
.el-tag + .el-tag {
  margin-left: 10px;
}
.button-new-tag {
  margin-left: 10px;
  height: 32px;
  line-height: 30px;
  padding-top: 0;
  padding-bottom: 0;
}
.input-new-tag {
  width: 90px;
  margin-left: 10px;
  vertical-align: bottom;
}
</style>